<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>06_列表渲染_过滤与排序</title>
</head>
<body>
<!--
1. 列表过滤
2. 列表排序
-->

<div id="demo">
    <input type="text" v-model="searchName">
    <ul>
        <li v-for="(p, index) in filterPersons" :key="index">
            {{index}}--{{p.name}}--{{p.age}}
        </li>
    </ul>
    <div>
        <button @click="setOrderType(2)">年龄升序</button>
        <button @click="setOrderType(1)">年龄降序</button>
        <button @click="setOrderType( 0)">原本顺序</button>
    </div>
</div>

<script type="text/javascript" src="../js/vue.js"></script>
<script type="text/javascript">
  new Vue({
    el: '#demo',
    data: {
      searchName: '',
      orderType: 0, // 0代表不排序, 1代表降序, 2代表升序
      persons: [
        { name: 'Tom', age: 18 },
        { name: 'Jack', age: 17 },
        { name: 'Bob', age: 19 },
        { name: 'Mary', age: 16 }
      ]
    },
    computed: {
      filterPersons() {
        let {searchName, persons, orderType} = this;
        let arr = [...persons];
        if(searchName.trim()){
          arr = arr.filter(p => p.name.indexOf(searchName) !== -1);
        }
        if(orderType){
          arr.sort(function (p1, p2) {
            if(orderType===1) { // 降序
              return p2.age-p1.age
            } else{ // 升序
              return p1.age-p2.age
            }

          })
        }
        return arr;
      }
    },

    methods: {
      setOrderType(value){
        this.orderType = value;

      }
    }
  })
</script>
</body>
</html>
